> On 8 Apr 2018, at 19:14, John R. Levine <jo...@iecc.com> wrote: > > I know it's ugly, but is there any rule that forbids putting an MX in a > reverse zone?
No, though talk to Joe Abley if you want some practical interop experience :-) https://mailarchive.ietf.org/arch/msg/dnsop/Ttvz3m_x7PyS6czeT-K9VQYQeqY/?qid=bff38cd5089003ca0d849bb8f2150644 Similarly, there’s nothing stopping you from putting PTR records in the “forward” DNS - my dodgy VM provisioning scripts stuff EUI48 <-> hostname maps in the DNS (the vm’s MAC address is its most persistent externally visible identifier). 08-00-27-b6-01-b4.dev.dns.cam.ac.uk. 3 IN PTR vm0.dev.dns.cam.ac.uk. vm0.dev.dns.cam.ac.uk. 3 IN EUI48 08-00-27-b6-01-b4 Tony. -- f.anthony.n.finch <d...@dotat.at> http://dotat.at
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